Which blood pressure medication primarily works as a beta-blocker?

Atenolol is recognized as a beta-blocker that primarily works by blocking beta-adrenergic receptors in the heart and blood vessels. This action helps to reduce heart rate and force of contraction, which in turn decreases overall cardiac output and lowers blood pressure. Beta-blockers like atenolol are often used in the management of hypertension and various cardiac conditions because they can improve heart function and reduce the risk of complications associated with high blood pressure.

Metoprolol, while also a beta-blocker, is specifically not the chosen answer in this scenario. Valdecoxib is a nonsteroidal anti-inflammatory drug (NSAID) and does not have beta-blocking properties, and furosemide is a diuretic that functions by promoting the excretion of water and electrolytes, which helps lower blood pressure through different physiological mechanisms. Therefore, atenolol is the correct choice as it directly exemplifies the action of a beta-blocker in the context of blood pressure management.